Alfred thomas



(No Model.)

-A. &. P. THOMAS.

GAS PRESSURE INDICATOR.

Patented Mar, 26, 1889. v

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ALFRED TH NITED STATES PATENT OFFICE.

OMAS, OF WEST COVVES, ISLE OF \VIGHT, AND PHILIP THOMAS, OF BUOKINGl-IAM, COUNTY OF BUCKS, ENGLAND.

GAS-PRESSURE INDICATOR.

SPECIFICATION forming part of Letters Patent No. 400,267, dated March 26, 1889. Application filed July 11, 1888. Serial No. 279,695. (No model.) Patented in England January 30, 1888, No. 1,366.

To all whom it may concern.-

Be it known that we, ALFRED THOMAS and PHILIP THOMAS, subjects of the Queen of Great Britain, residing, respectively, at the Gas \Vorks, West Cowes, Isle of \Vight, and the Gas Works, Buckingham, in the county of Bucks, England, have invented a new and useful Foul-Gas-Pressure Indicator, (for which we have obtained a patent in Great Britain, No. 1,366, dated January 30, 1888,) of which the following is a specification.

We make the indicator of two glass tubes, one to be used inside the other. The outer one has a solid bottom, While the inner one is open at both ends and is slightly the longer. We use an upright back plate, which can be made either of wood ormetal. At the lower end of back plate we fix asmall shelf which has a hole sunk part of the way in to receive solid end of outer tube; or a ferrule may be fixed upon shelf, which answers the same purpose. At the top of back plate we fix a cap-ring, through which the outer tube is passed. The cap-ring at top and the hole in shelf or ferrule fixed upon shelf are for the purpose of keeping the tube in its place. To admit of the water passing freely from the inner to the outer tube, the lower end of the inner tubeis in free communication by lateral passages with the interior of the outer tube.

One or any number of the indicators can be placed upon the back plate, as may be desired; but we prefer making them in pairs, and so make one rule answer for two indicators.

To use the indicator, the gas is passed by means of a flexible pipe into the inner tube, and, coming in contact with the water, displaces part of the same, driving it into the outer one. The difference between the two Water-levels shows the amount of pressure upon the appara tus.

These indicators can be made of any diameter or length.

The construction of our apparatus will be understood by reference to Figure 1, and for double apparatus by reference to Fig. 2, in which 'the lower end of the vessel and the socket-piece are shown in section and indicating the uneven bottom edge of the tube, which permits of the free passage of liquid between the vessel and the tube.

A is the vessel, and B the socket-piece into which the lower end of the vessel is stepped.

O is the shelf of the bracket or back D, which may be of wood or metal.

E is the strap or-clip which fixes the upper part of the vessel A in a vertical position.

F is the tube which is centralized in the vessel A by the cap-ring G, the end of the tube F projecting above said ring for the attachment of a flexible tube, H, so that the gas from a branch with which the flexible tube is connected can enter the tube F and press upon the liquid placed therein, which liquid finds its level in the vessel A by reason of the apertures or uneven bottom edge of the tube F. The cap G in addition to centralizing the tube F in the vessel A, prevents the entrance of dust, so that the liquid is kept clean; and, to enable the liquid to be changed at any time, the flexible tube'H can be slid off from the tube F and the apparatus removed and emptied for cleaning.

By this invention we produce agas-pressure indicator which has no fixed joints, thus doing away with all possibility of breakage through undue expansion and contraction, and by reason of having no fixed joints skilled labor is not required when cleaning is neces- 8o sary. Should any part of the indicator be broken by accident, such broken parts have only to be lifted out and replaced by new ones.

The indicator requires no fixing, but is made to hang upon a wall. It is easily removed to other parts of a works when required.

We claim as our invention A gas-pressure indicator having no fixed joints, and consisting of a supporting back 0 piece provided with a shelf, an outer liquidcontaining tube closed at its bottom and supported on said shelf, a cap secured to the upper end of the outer tube and provided with a central orifice, and an inner tube centered 95.

in the outer tube and having its lower end open and in free communication with the our names, in the presence of two subscribing outer tube above the closed bottom thereof, Witnesses, this 24th day of May, 1888. said lnner tube entendlng upward through ALFRED THQMAS thecapzrnd hnvnm'its upperopen end adapted y i Aq l b l IIILI]. JIIOM r. 5 to connect with a gas-mfiow tube for passing gas down the inner tube and causing the liquid \Vitnesses: therein to pass through the open lower end of HENRY GARDNER, said inner tube into the base of the outer Pafent iiigent, tube, substantially as described. 7 CHARLES ALFRED Gnossonn'rn, o In witness whereof wehn-ve hereunto signed Both of 1.66 Fleet Street, London, England. 

